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I had the first error as well, and I found that it is fixed if you go to /opt/ros/hydro/stacks and then do

mkdir stacks

then you will no longer have the error pop-up. I am relatively new to ROS so I don't know what the package was for or what this quickfix will do in the long run, but it fixes it for now.

I had the first error as well, and I found that it is fixed if you go to /opt/ros/hydro/stacks and then do

mkdir stacks

then you will no longer have the error pop-up. I am relatively new to ROS so I don't know what the package folder was for or what this quickfix will do in the long run, but it fixes it for now.

I assume the second error could be fixed via a similar method, but i'd make sure all of your python stuff is up to date on your system before that.